Recently, multiple norovirus cases have emerged in Guangzhou middle schools. Some parents have also received spring epidemic prevention reminders from schools, stating that "spring is a high-risk season for diseases like meningococcal meningitis, rubella,mumps, and hemorrhagic fever. Schools are densely populated environments where respiratory infections can rapidly trigger localized outbreaks." Parents were advised that children "must not return to school if exhibiting symptoms such as fever, vomiting, or diarrhea" and "may only resume attendance 72 hours after symptoms subside."
In response, infectious disease experts note that Guangzhou's epidemic prevention planning has been effective in recent years, with low risks of outbreaks for diseases like meningococcal meningitis, rubella, mumps, and hemorrhagic fever. Influenza, however, remains the primary infectious disease requiring focused prevention each spring.
Isolated Cases: Schools Report Norovirus Outbreaks
Parents Receive Early Warning Notices
Recently, Guangzhou's Zhen Guang Middle School in Baihe Dong experienced a cluster outbreak of infectious diarrhea. Multiple students sought hospital treatment, with confirmed cases attributed to norovirus. All affected students presented mild symptoms requiring no hospitalization.Following the outbreak, school authorities underwent professional disinfection training from disease control personnel and immediately conducted comprehensive cleaning and multiple disinfections of classrooms, dormitories, cafeterias, restrooms, and water sources.
"Many students at my son's school have also taken sick leave," Ms. Chen told reporters. She also received a spring disease prevention reminder from her child's elementary school stating: "Spring is the peak season for diseases such as meningococcal meningitis, rubella,mumps, and hemorrhagic fever. As schools are densely populated environments, respiratory infections can rapidly trigger localized outbreaks. To safeguard the health of students and staff and maintain normal educational operations, parents are urged to keep children home if they exhibit symptoms such as fever, vomiting, or diarrhea. Immediate notification to the homeroom teacher or school nurse is required, followed by prompt medical attention...Children may return to school only after 72 hours of symptom resolution."
Upon receiving the school's text alert, many parents expressed concern: How high is the risk of their children contracting these infectious diseases? What preventive measures should be taken?
Expert Insights: Meningococcal Disease, Rubella, Mumps
Low Probability of Outbreak
"Guangzhou's planned immunization program has been highly effective in recent years. Most children receive vaccinations at designated ages for disease prevention."Wang Ming, Director of the Guangzhou Center for Disease Control and Prevention, explained that the vast majority of children in Guangzhou participate in various vaccination programs after birth. They have generally received vaccines for meningococcal disease and the MMR vaccine, which specifically protects against three common childhood acute respiratory infectious diseases: measles, mumps, and rubella.
"Of course, not every child receives vaccinations, and even when administered, vaccines aren't 100% effective," Wang noted. This explains why sporadic cases of meningococcal disease, rubella, and mumps still occur. Hemorrhagic fever, primarily transmitted by rodents, isn't included in the national routine vaccination schedule, but vaccines are available for preventive injections when necessary.
Wang Jian, Director of the Second Infectious Diseases Department at Guangzhou Eighth People's Hospital, reported based on years of clinical observation that recent outpatient visits have only seen isolated cases of norovirus infection. The cases of "meningococcal disease, rubella, mumps, and hemorrhagic fever" that Ms. Chen and many parents were concerned about have indeed not occurred.
"In terms of seasonal patterns, meningococcal disease typically peaks between November and January of the following year."Wang Jian explained that meningococcal bacteria can spread through respiratory droplets, though transmission is not highly contagious. While a localized meningococcal outbreak did occur among migrant workers, residents, and students in Guangzhou's University Town area from late 2004 to early 2005, only sporadic cases have been reported over the past decade. Furthermore, in Guangzhou, the likelihood of meningococcal disease outbreaks generally decreases after March each year.As for rubella and mumps, widespread outbreaks are unlikely due to increasingly effective immunization programs. Hemorrhagic fever typically occurs in summer and autumn, transmitted through contact with infected rodents or contaminated water. Risks are primarily found in suburban areas with rodent activity or unsanitary environments.
However, urban areas have significantly improved hygiene conditions in recent years through rodent control, extermination, and enhanced food, environmental, and personal sanitation.In other words, the various infectious diseases mentioned in the school's spring epidemic prevention reminder currently pose a low risk of outbreak in Guangzhou and are unlikely to cause widespread epidemics. Expert Analysis Spring's Warmth and Humidity Boost Viral Activity; Influenza Enters Peak Season "As spring brings rising temperatures and increased humidity, bacteria and pathogens become relatively more active. This external environment contributes to a higher incidence of infectious diseases,"Wang Jian noted that influenza—specifically types A and B—is the most common infectious disease in Guangzhou during March. Most patients contract influenza A, with influenza B being less prevalent. The influenza virus spreads through airborne droplets or contact with infected individuals or contaminated objects, causing acute high fever, body aches, significant fatigue, and respiratory symptoms.
According to Yang Zhicong, Deputy Director of the Guangzhou Center for Disease Control and Prevention, influenza activity has noticeably increased since early March compared to January and February. Schools in Guangzhou have intensified flu prevention measures, reinforcing routine practices such as morning health checks, classroom ventilation, and frequent handwashing.
"Beyond influenza, some schools have reported sporadic chickenpox cases during the Spring Festival period in previous years,"" Wang Jian explained that chickenpox is primarily transmitted through contact and can occur year-round, though it is relatively more common in winter and spring. Additionally, hand-foot-and-mouth disease carries a higher transmission risk during the transition from spring to summer each year.
"Due to accelerated bacterial growth caused by climate changes, norovirus infections stemming from contaminated food also occur frequently in spring,"" Wang Jian noted that this enterovirus typically causes localized outbreaks only in specific group settings with poor food hygiene and generally does not lead to widespread epidemics.
Expert Advice
Seek Early Medical Attention for Children with Fever, Vomiting, or Diarrhea to Identify the Cause
"To prevent influenza, chickenpox, and the aforementioned meningococcal disease, rubella, and mumps, vaccination is certainly the best approach."Wang Jian noted that beyond vaccination, parents should avoid crowded public spaces with poor ventilation. Children should be encouraged to develop good hygiene habits like frequent handwashing and clothing changes. Maintaining dietary hygiene, regular routines, adequate sleep, and balanced physical activity can enhance immunity and disease resistance.
Wang Jian cautioned that fever, vomiting, and diarrhea may indicate certain infectious diseases. If a child develops a fever accompanied by lethargy or a high temperature exceeding 39°C (102.2°F), immediate medical attention is essential.If diagnosed with infectious diseases like influenza or norovirus, strict self-isolation is crucial. For instance, wear a mask when sick with flu to prevent droplet transmission through coughing, sneezing, or close conversation. During isolation, keep personal items and food strictly separate from others until symptoms resolve and contagion risk subsides.
"Early detection, isolation, diagnosis, and treatment can effectively reduce the contagiousness and shorten the duration of illnesses like influenza," said Wang Jian. Clinically, early treatment with oseltamivir shows good efficacy for influenza, not only lowering contagiousness but also alleviating discomfort and reducing complications.